非球形粒子的光学特性是国际研究的前沿课题,而柱状粒子作为一种典型的非球形粒子,研究其对光偏振特性的影响是解决非球形问题重要的一步。采用T矩阵方法,仿真得到柱状粒子的散射矩阵,再根据散射矩阵中包含的偏振信息,计算求得光经过柱状粒子后的偏振度。在其他参数不变的条件下,分别改变柱状粒子折射率、有效半径、形状,得到相应的仿真结果,处理数据,研究这三个参数对光偏振特性的影响。结果表明:前向散射时,折射率实部越大,柱状粒子对应的光偏振度越大,后向散射时,则与之相反;折射率虚部越大,柱状粒子的形状对偏振度的影响越小;随着有效半径的增加,通过柱状介质的光偏振度的最大值在减小;形状不同的柱状粒子在散射角0~50°之间时,偏振度的曲线变化趋势接近。

The optical properties of nonspherical particles is a frontier of international research. As the cylindrical particles is a kind of typical non spherical particles, studying its effect on the polarization transmission characteristics is an important step to solve the problem of nonspherical. In this paper, T matrix method is used to simulate the scattering matrix of cylindrical particles, and then calculate the degree of polarization of the light passing through the cylindrical particles according to the polarization information contained in the scattering matrix. Under the same parameters, changing cylindrical particle refractive index, effectiveradius, shape respectively, the results are obtained by simulating, then processing the corresponding data to analyze the influence of these three parameters on the polarization characteristics. The results show that at the forward scattering, the refractive index of the real part of the larger cylindrical particle polarization degree bigger, and at backscattering, the conclusion is opposite . When the imaginary part of the refractive index become larger, the shape of cylindrical particles has a smaller impact on polarization. With the increase of the effective radius, the degree of polarization in the maximum value of cylindrical particles decreases. The trend of polarization curve is close, when the scattering angle is from 0 to 50 degrees.